Effective fermion-Higgs interactions at an e(+)e(-) collider with polarized beams

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Huitu , K , Rao , K , Rindani , S D & Sharma , P 2016 , ' Effective fermion-Higgs interactions at an e(+)e(-) collider with polarized beams ' Nuclear Physics, Section B , vol. 911 , pp. 274-294 . DOI: 10.1016/j.nuclphysb.2016.08.004

Title: Effective fermion-Higgs interactions at an e(+)e(-) collider with polarized beams
Author: Huitu, Katri; Rao, Kumar; Rindani, Saurabh D.; Sharma, Pankaj
Contributor: University of Helsinki, Helsinki Institute of Physics
Date: 2016-10
Language: eng
Number of pages: 21
Belongs to series: Nuclear Physics, Section B
ISSN: 0550-3213
URI: http://hdl.handle.net/10138/183648
Abstract: We consider the possibility of new physics giving rise to effective interactions of the form e(+) e(-) Hf (f) over bar, where f represents a charged lepton l or a (light) quark q, and H the recently discovered Higgs boson. Such vertices would give contributions beyond the standard model to the Higgs production processes e+ e-. H l(+) l(-) and e(+) e(-) -> Hq (q) over bar qat a future e(+) e(-) collider. We write the most general form for these vertices allowed by Lorentz symmetry. Assuming that such interactions contribute in addition to the standard model production processes, where the final-state fermion pair comes from the decay of the Z boson, we obtain the differential cross section for the processes e(+) e(-) -> H l(+) l(-) and e(+) e(-) -> Hq (q) over bar to linear order in the effective interactions. We propose several observables with differing CP and T properties which, if measured, can be used to constrain the couplings occurring in interaction vertices. We derive possible limits on these couplings that may be obtained at a collider with centre-of-mass energy of 500 GeV and an integrated luminosity of 500 fb(-1). We also carry out the analysis assuming that both the electron and positron beams can be longitudinally polarized, and find that the sensitivity to the couplings can be improved by a factor of 2-4 by a specific choice of the signs of the polarizations of both the electron and positron beams for the same integrated luminosity. (C) 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license.
Subject: VIOLATING DIPOLE COUPLINGS
LINEAR COLLIDER
TOP-QUARK
CP
ASYMMETRIES
BOSON
DISTRIBUTIONS
ELECTRONS
PHYSICS
114 Physical sciences
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